Method for providing a real time view of heterogeneous enterprise data

ABSTRACT

A method for providing a real time view of heterogeneous enterprise data of operational systems includes capturing streams of operational events in real time, combining the events with contextual data, and materializing a resulting view. The resulting view includes a dynamically defined view of the stream of events and provides visibility into a current state of the operational system. A view snapshot is continuously incrementally updated by a view maintenance engine as a stream of rows. The views are used to evaluate a business rule. An alert is fired when a business rule holds true. To enable the view in a view engine, a SQL string characterizing the view is parsed into a parse tree, which is normalized to form a query graph. The query graph is then optimized to obtain a query plan, which is compiled into an operator graph. Queries are executed based upon the operator graph.

This application is a divisional of U.S. application Ser. No. 12/400,626, filed Mar. 9, 2009, which is a divisional of U.S. application Ser. No. 10/446,336, filed May 27, 2003 which issued on Apr. 21, 2009 as U.S. Pat. No. 7,523,462 entitled “METHOD FOR PROVIDING A REAL TIME VIEW OF HETEROGENEOUS ENTERPRISE DATA,” the entire content of both of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to the field of business intelligence. More specifically, embodiments of the present invention relates to a method for providing a real time view of heterogeneous enterprise data.

BACKGROUND ART

Business intelligence and data warehousing software enable information from disparate parts of an enterprise to be obtained with relative ease. Great decision-making benefits are generated by business intelligence (BI). BI software integrates querying, reporting, on-line analytic processing (OLAP), data mining, and data warehousing functionality.

Such decision-making benefits are provided by BI software because they enable a user to process information from as many databases as comprise a business (or other) organisation's data storage resources. Further, BI software allows analysis of needed transactions and summaries, without having to know which databases, servers, and/or other information sources from which the information underpinning such transactions and summaries were derived.

By way of background with respect to the applications to business and other enterprises, an ‘event’ represents a business event, which is a business activity, transaction, or a change in the state of a business entity for instance. In a large business. Implicitly, events comprise a time of occurrence and an identity. Examples of events include, but are not limited to, issuing a purchase order, taking a customer service call, replenishing supplies, issuing a forecast, and posting an expense item.

A ‘context’ represents data associated with an event. Typically, contexts are data that are descriptive of the events. A context can also comprise historic summary data, which can be available in a data warehouse or operational data store (ODS). Context data may also be obtained from other systems of record. Context data provides additional information that may be required for adding meaning to an event. Context data, in so far as it can be conventionally utilized, can be evaluated to ascertain whether or not a given event should trigger a heightened state of scrutiny and observation by analysis of the business environment in which a business or other enterprise is immersed.

Modern businesses face significant and increasing needs to obtain real time access to key business events. This need, for instance, can be expressed as a requirement from a business person that indicates that the certain business metrics need to be monitored in real-time or that when certain changes in these metrics caused by various business events imply adverse conditions or an opportunity, this is cause for an ‘alert’, e.g., notation of event occurrence, and heightened monitoring of associated data thereafter.

The event, for example could be an increase in call volume into a call center, inventory falling below a certain threshold level, a drop in a demand forecast, increase in the number of returns of a certain product, or that defect rates from a test system exceeded pre-specified limits, etc. At the occurrence of such an event, the business person may want a corresponding alert to attract and guide her/his attention.

Conventional reporting and analysis software (variously called Business Intelligence, Query and reporting tools. Data warehouses etc.) (“BI software”) all provide reporting and analysis of business data. They do so by either executing queries directly against operational systems or by extracting and transforming in batches, operational data to an independent data store (sometimes called a data warehouse or data mart).

The above method by conventional reporting software results in the usage of a fixed (or static) data model from which data is analyzed. As a result of that, alert conditions cannot be detected without repeatedly running the reports on the data model, often resulting in poor performance of reports or an impact on the operational system itself, if reports are being run directly on it. In addition since the data is often extracted in batches, the resulting metrics are often hours to days old and therefore unsuitable for real-time analytics.

Some conventional reporting products contain alerting technology, however the alerting is based on repeated processing of batch data and on a fixed data model that is inflexible to the needs of real-time analytics.

Other mechanisms, also called event management software provides for alert conditions to be detected and alerts sent, however, it similarly uses fixed data models and batch updates to the date model and suffers the associated drawbacks described above.

Without event processing capabilities, the ability to combine events with context, and powerful business rules processing capability, the ability of a business organization or a similar organisation utilizing BI software to engage in real time data analysis is limited. Lacking ability to engage in real time date analysis, a business organization or a similar organisation utilizing BI software has only a limited capability at best to react instantaneously to changes in its business and to the business environment in which it operates.

SUMMARY OF THE INVENTION

A method for providing a real time view of heterogeneous enterprise data of operational systems is disclosed. The method comprises capturing a stream of operational events in real time and materializing a resulting view. The resulting view comprises a dynamically defined view of the stream of events and provides visibility into a current state of the operational system.

In one embodiment, a view snapshot is continuously incrementally updated by a view maintenance engine as a stream of rows. Context, which is static or changes relatively slowly, is updated upon changes to a context table as that context table is added to a next row. Views include business views and hidden views. The views are used by a rules engine to define hidden views for evaluating a business rule. A user can define a business rule from online. An alert is fired when a business rule holds true. Views can be stateful or stateless. A view is stateful if it contains states determined by stream data consumed by the view; otherwise, it is stateless.

A resultant view can be generated by a view defined by a query in a Structured Query Language (SQL), joining across several views where one view comprises an event view and the remainder comprise a context view, modeling the event as a data stream and the context view as a relation, retrieving a row corresponding to the context view, and constructing a compound row(s) comprising a row(s) from the data stream and a row(s) from the context view.

To enable the view in a view engine, where the view is received as a SQL string, the SQL string is parsed info a parse tree, which is normalized to form a query graph. The query graph is then optimised to obtain a query plan, which is compiled into an operator graph. Queries are executed based upon the operator graph.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts a system for generating a real time view of heterogeneous enterprise data, according to one embodiment of the present invention.

FIG. 2 depicts a view engine, according to one embodiment of the present invention.

FIG. 3 depicts a view maintenance network, according to one embodiment of the present invention.

FIG. 4 is a flowchart of a process for compiling and enabling a business view, according to one embodiment of the present invention.

FIG. 5 is a flowchart of a process for determining the statefulness of a view, according to one embodiment of the present invention.

FIG. 6 depicts a query engine view processor, according to one embodiment of the present invention.

FIG. 7 is a flowchart of a process for processing a view, according to one embodiment of the present invention.

FIG. 8 depicts a query iterator graph, according to one embodiment of the present invention.

FIG. 9 depicts a left deep query tree, according to one embodiment of the present invention.

FIG. 10 depict a bushy query tree, according to one embodiment of the present invention.

FIG. 11 is a flowchart of a process for generating a real time view of heterogeneous enterprise data, according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

A method for generating a real time view of heterogeneous enterprise data is disclosed. In the following detailed description of an embodiment of the present invention, a method for generating a real time view of heterogeneous enterprise data, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be recognized by one skilled in the art that the present invention may be practiced without these specific details or with equivalents thereof. In other instances, well-known methods, procedures, and components, have not been described in detail as not to unnecessarily obscure aspects of the present invention.

Embodiments of the present invention are directed to a method for generating a real time view of heterogeneous enterprise data that are both event-definitive and context-definitive and can provide a streaming view of dynamically changing data. In one embodiment, a computer-based system executes the method for generating a real time view of heterogeneous enterprise data. In one embodiment, a computer usable medium having a computer readable program code embodied therein causes a computer system to perform the method for generating a real time view of heterogeneous enterprise data.

Thus, an embodiment of the present invention overcomes the limitations of conventional BI software, which is neither sufficiently event-definitive nor context-definitive, and which assumes data is operated on in scheduled batches, not event driven, and not external to a particular database system. An embodiment of the present invention readily formulates and sustains a maintainable real time view of business events, such as transactions, and related occurrences, incidents, and circumstances. The view can be an asynchronous one. Further, an embodiment of the present invention has contextually interpretive and dynamically predictive capability.

Notation and Nomenclature

As the terms are used herein, the following terms can have meanings comprising the following definitions. An ‘event’ is any change in the value of a critical data element in a transactional system that must be captured for the purpose of monitoring its value.

A ‘context’ is additional information added to an event to make it easier and/or more profitable to analyze the event to determine whether action is needed. ‘Event context’ is the combination of an event view with a context. An event context can be an entity on which an end user alerting business rule is built. Event context appears in one embodiment as a simple view in Structured Query Language (SQL), for purposes of defining rules for alert generation. Context can comprise, for example, historical data.

Exemplary System

Basic System Overview

FIG. 1 depicts a system 100 for generating a real time view of heterogeneous enterprise data, according to one embodiment of the present invention. System 100 thus functions as a business activity monitoring (BAM) system.

System 100 provides a real time view of heterogeneous enterprise data of an operational system, comprising capturing a stream of operational events in real time and materializing a resulting view. The resulting view comprises a dynamically defined view of the stream of events and provides visibility into a current state of the operational system.

There are two fundamental ways of entering data into system 100: push and pull. System 100 can subscribe to some events and the event data would then be pushed to the system. System 100 can also pull data for events and contexts using queries in the source system format.

Push of data info system 100 is done asynchronously. System 100 subscribes to event publishers, through asynchronous publishing mechanisms such as a Java messaging service (JMS) message bag. Pulling of data into system 100 is done through issuing synchronous (blocking) queries to the source systems.

System 100 models the event as an event view, and the context data as a context view. Events are captured by an event capturer 101, which outputs the captured event to a view maintenance engine 103. Contexts are captured by a context capturer 102, which outputs the capturer context to the view maintenance engine 103.

View maintenance engine 103 materializes views as rows. View maintenance engine 103 outputs materialized view rows, along with any corresponding reportlets it generates, to a rule engine 104.

Rule engine 104 applies a business rule to each materialized view and outputs a alert where the rule holds true to an alert deliverer/tracker 105. The alert is sent along with any corresponding reportlets.

Alert deliverer/tracker 105 delivers and tracks the alert, along with any reportlets, to users. The alert and any reportlets can be sent by any of a variety of media, such as email, a hypertext transfer page (HTTP) format, and/or a spreadsheet.

Exemplary View Engine

FIG. 2 depicts view maintenance engine 103, according to one embodiment of the present invention. The view engine 103 maintains (e.g., functions as) a main memory system that processes the event streams entering system 100, continuously maintains the views, and provides the materialised view rows to the rule engine and the reportlet engine. The view engine 103 also provides a limited query capability for a reportlet engine 206. Business users use the materialized views to define business rules online. Further, view engine 103 maintains a time dimension, avowing for temporal or time series analysis of events and data.

There are two kinds of views: business views and hidden views. The business views are the views defined by application developers and used by the business users to define business rules. The hidden views are defined by the rule engine 104 and reportlet engine 206 for the purpose of evaluating rules.

The hidden views are therefore generated by the system 100 and are not visible to the users. The hidden views are processed similarly as the business views. Therefore for clarity, brevity, and ease of explanation, reference to business views herein also includes reference to hidden views, unless otherwise noted explicitly.

An event stream thread 202 is asynchronously pushed or synchronously pulled from a source system 201. View engine 103 receives an event from event stream thread 202 of event capturer 101 (FIG. 1).

Context can include historical or other data meaningful to an event. Context can add significance to the event. The context, modeled as a relation, has a local cache 205 that can return cached context look up query result. Context can be synchronously pulled by context capturer 102 (FIG. 1) from a source system 203, such as a data warehouse.

Business view 1 is termed from Event 1. Event 1 is joined with Context 1 to form Business view 2. Hidden rule view Fire, hidden rule view Raise, and hidden rule view Lower arise from Business view 2. Hidden rule view Raise is joined with Context 2 to form Business view 3, which synchronously sends a reportlet query to reportlet engine 206. Business view 3 can also asynchronously form a Hidden Reportlet view 1 which can be sent to reportlet engine 206. Hidden reportlet view 1 can also synchronously form Hidden Reportlet view 2. Hidden Reportlet views 1 and 2 are asynchronously sent to reportlet engine 206. Hidden rule views Fire, Raise, and Lower are sent asynchronously to rule engine 104.

Exemplary View Maintenance Network

FIG. 3 depicts an exemplary such view maintenance network, according to one embodiment of the present invention. Each node in the network represents an operator. Views are expressed in the form of a query language such as SQL. The following shows an example of a business view ‘price_and_inventory_monitor’.

Select os_prod_id as pim_prod_id Mov_avg(os.os_unit_price, month, 1 )as pim_unit_price, Mov_sum(pi.pi_inv_level,day,2) as pim_inventory_level From order_ status os, product_inventory pi Where pi.pi_prod_id =os.os_prod_id Group by os_prod_id The above view captures, on a per product basis, the monthly moving average of the selling price of a product, and the 2-day moving total of its inventory levels across all warehouses. The order_status is an event stream and product_inventory is a context view. A view (e.g., views 1-5) comprises the result of the join of an event view (e.g., event views 1, 2) or a view (called input stream) with a number of context views (called relation; e.g., contexts 1-3). Each view would then publish stream data (called output stream; e.g., output streams 301, 302)) as the result of the view maintenance. The result of one view's output steam can be subscribed by another view (e.g., views 4, 5) as input steam, and the entire system thus becomes a view maintenance network 300.

View maintenance network 300 perform a process 400 which can be described by the flowchart of FIG. 4. Process 400 compiles and enables a business view beginning with step 401, wherein for each business view, the optimal query processing plan (which can be algorithmic) is determined for continuously maintaining the view. In step 402, the view maintenance is started by subscribing the views to the stream publisher. In step 403, it is determined whether the view is stateful.

If it is determined that the view is stateful, then in step 404, it is determined whether the view has temporal or event window specifications. If it is determined that the view has temporal or event window specifications, then in step 406 the view is continuously maintained based on a moving window corresponding to the temporal or event window specifications. If it is determined that the view has no temporal or event window specifications, then in step 407, the view is continuously maintained based on regular ANSI SQL semantics.

If it is determined that the view is not stateful (e.g., if the view is stateless), then in step 405, new rows are generated that represent the current view snapshot for the last (e.g., latest) event. It is next determined in step 408 whether the view has a temporal or event based moving window specification for the view snapshot. If not, then in step 409, the view snapshot is updated with new rows.

If it is determined that the view has a temporal or event based moving window specification for the view snapshot, then in step 410, new rows are added to the view snapshots and the view snapshots are adjusted. Process 400 can be complete upon executing steps 406, 407, 409, or 410.

Referring again to FIG. 3, the view can be continuously maintained (e.g., Step 403 of Process 400; FIG. 4) by a process as described next. The view result (called view snapshot) at a time T contains the result of the view evaluation from the time the system is started until time T, by taking all rows arriving by time T from the event view, and joins them with the rows in the context views. For instance, the rows comprising stream 303 are joined with the rows comprising context 1. Similarly, the rows comprising stream 304 are joined with the rows comprising context 2, as are the rows comprising stream 305.

The view snapshot is continuously maintained, e.g., it is created based on the first event and then continuously updated based on subsequent events. The next event joins with the context rows and may or may not cause an update on the snapshot of the view. The view snapshot itself is a data stream that feeds into the next view. In one implementation, the view engine 103 (FIG. 1) effectively feeds change to a stream to views that defined on top of it, so that all views are continuously maintained.

Therefore, view maintenance in the present embodiment comprises continuous incremental view maintenance, as distinguished from incremental view maintenance. The data in the context views are static or slowly changing. A query engine (e.g., query engine 600; FIG. 6) does not update the view due to changes in the context tables. Changes in the context table rather would be reflected in the view when the context table is joined with the next event row.

For a SQL view query, the query engine first executes a FROM clause, which performs joins across multiple views. Exactly one of the views should be an event view, and the remaining should be context views. An event is modeled as a data stream, and a context view is modeled as a relation. The rows enter into the event view one event at a time (one event can contain multiple rows).

The rows for the context views are retrieved on demand during the join process, which can be exemplified as follows:

For each stream row Do

-   -   Fetch the event row     -   For each context view in the order determined by the optimizer         Do         -   Formulate a context query for the context view         -   Issue the context query to the context source and retrieve             the result             At this stage, compound rows have been constructed, each row             consisting of one row from the stream and each context view.             The view snapshot is incrementally maintained based on the             new row.

The result of the view maintenance produces the current view snapshot, which depicts the current state of the view. In one embodiment, an update to the view snapshot is done only when a new input stream row is produced. In the present embodiment, the process does not update the view snapshot due to changes to the context views. The view also maintains a time window of events and context. Such view maintenance is thus continuous incremental view maintenance, in contrast to incremental view maintenance.

A view is a stateless view if it is not stateful. An event view (e.g., event views 1, 2; FIG. 3) is stateless. A view is stateful is it contains a GROUP BY clause or any set function in the SELECT clause, or it is defined on top of a stateful view. Thus, a process 500 for determining whether a view is stateful or stateless is depicted in FIG. 5. Process 400 begins with a step 501, wherein a view is examined. In step 502, it is determined whether the view comprises a ‘group by’ clause or a ‘set’ function in a ‘select’ clause.

If so, then in step 504, the view state ‘STATEFUL’ is returned, at which point process 400 can be complete. If not, then in step 503, it is determined whether the view is defined on top of a business view that is itself stateful. If so, then in step 504, the view state ‘STATEFUL’ is returned. If not then in step 505 the view state ‘STATELESS’ is returned, completing process 500. The system then sets the view state in a bottom up fashion: the views other views define on are marked for statefulness before those views defined on top of them.

Exemplary Query Engine

FIG. 6 depicts a query engine 600, according to one embodiment of the present invention. A SQL parser 602 receives a SQL string 601 and parses it. SQL parser 602 outputs a parse tree 603 to a normalizer 604. Normalizer 604 normalizes the parse tree 603 and outputs a query graph 605 to a query optimizer 606. Query optimizer 606 outputs a query plan 607 to a plan compiler 608. Upon compiling the query plans 607, plan compiler 608 outputs an operator graph 609 to a query executor 610. Query executor 610 executes the queries. Common services 620 available comprise a type manager 621, an expression evaluator 622, and a row manager 623.

A view, defined in SQL string 601, is submitted to the query manager 600 for enabling in the view maintenance network. The query manager 600 calls the parser 602, normalizer 604, optimizer 606, and plan compiler 608, with the view definition SQL string 601, to come up with an Executable Plan 615, which is executed by query executor 610. The Executable Plan is a query iterator tree. The query manager 600 then asks the executor 610 to open the query iterator tree. The query executor 610 opens all the iterator nodes 611 in the tree, the open operation of the stream (event view or view) scan iterator 612 makes a subscription request 613 to the view subscription manager 614, which puts the current Executable Plan object as one of the subscribers of the view. The query manager 600 then submits the Executable Plan 615 to the system executor 630, which executes the view maintenance operations.

Query engine 600 operates by a process 700 depicted in FIG. 7. Process 700 begins with step 701, wherein a SQL string comprising a view is received. In step 702, the SQL string is parsed. In step 704, a parse tree is sent to a normalizer, where it is normalized in step 705. In step 706, the query is optimized. In step 707, a query plan is sent to a query compiler, which compiles it in step 708. In step 709, an operator graph is sent to a query executor, which in step 710, executes the query.

Each physical iterator operates on a number of rows and produces a number of rows. It may take two inputs (e.g., join) or one input (e.g., group by). All operators are independent of one another. The operators are linked together by the optimizer to form an operator DAG (query iterator graph) 609, which is an executable form to be executed by the query executor 610. An operator does not know the detail of another operator. They are linked together by the optimizer 606.

Referring again to FIG. 6, each operator performs one specific functionality; it contributes to one step in the process of continuously maintaining the view snapshot. All operators except the view exchange operator do not need to consider multi-threading issues. The query execution plan 607 is represented as an operator graph 609, and the operator graph 609 is invoked from the top to bottom using the open( ) call recursively. Each operator has an array of children operators.

Each operator implements methods as listed in Table 1 below.

TABLE 1    Create( ): instantiate the operator and all of its children.    Open ( ): open an iterator, and open all its children. This prepares the operator for incremental view maintenance.    Next (QEDataContext): get next row from the operator. The new row is stored at the QEDataContext. The QEDataContext object contains information about the new row being assembled.       Return NEXT when there is a new row in the QEDataContext.       Return STREAMDONE if it reaches the end of the rows for the current stream. Then the caller needs to call next( ) again to get the rows for the next event. This only applies to iterators for stream. A stream iterator is either a StreamScanIterator or any iterator above it.    Return DONE to indicate no more rows.    For relational source, this call either returns NEXT or DONE, it would never return STREAMDONE. This only applies to RemoveScanIterator or join iterator that do not have any stream iterator below it    An iterator would return STREAMDONE if it gets STREAMDONE from its child iterator.    Close ( ): free all operator states, close this iterator and close all its children    Free ( ): free resources and destroy the iterator and its children    The entire query execution plan is a graph of query operators. An operator is in the status of one of the following, at any point in time:    COMPILATION: plan compilation phase    CREATE: the iterator has just been instantiated    OPEN: the iterator has just been opened for processing the next event    NEXT: at least one RowList has been retrieved from this iterator.    DONE: end of the data stream has been reached for the last next call    STREAMDONE: end of the event stream has been reached for the last next call    CLOSE: its input has been closed.    FREE: it is being destroyed and freed. Table 2 below shows processes for the main operators.

TABLE 2 Local Operator Create Open Next Close state EventScan: Create Subscribe Next event row Un- Unreturned Subscribe the to stream. or return Done. subscribe rows to steam. operator Apply filters Get stream and rows. all its children View Same Open input Input.next( ) until Input.close( ) VCRow[ ] exchange: as hit which is maintain above STREAMDONE, the view then publish snapshot snapshot new snapshot. of the Then call query. input.next( ) again RemoteScan: Same Open a Extract the bind Close the Context Scans a as source and values from source cache. context above prepare a Rows. Prepared table. statement call statement Optionally for jdbc BindAndExecute( ). handle. look up source. Apply filters. Unreturned cache Initialize a Return one row. Rows context Return the rest in cache if set subsequent next( ) calls. Nested Same Input.open( ), Call input.next( ) Input.close( ) None Loop Join as Input2.open( ) to populate the Input2.close above left table row, if ( ) success, then call input2.next( ). If success, apply post join filters. Join filters are being applied at the input2 iterator. Groupby: Same Input.open( ). Keep calling Input.close( ) Unreturned groupby as Input.next( ) until rows. and set above. see Grouped function STREAMDONE rows in evaluation or DONE, then the hash perform group table by. Then evaluate the aggregation expressions by putting new row in the right group. Return one row at a time to its caller. Setting the implicit column values Projection: Same Input.open( ) Input.next( ). Apply Input.close( ) project as post select wanted above filters. Copy out columns VcValue. Set implicit VC column values.

FIG. 8 depicts an exemplar of query operator graph 609. Each view contributes a number of operators in the entire view maintenance network, and the entire view maintenance network becomes a one directional operator graph. An exemplar of such an operator network is depicted in FIG. 3 as view maintenance network 300.

Stateful queries can exist, which differ from the view. The views are continuously incrementally maintained, each maintenance operation is triggered by a new stream event. The queries also have states, and its states are incrementally maintained. However, its maintenance is triggered based on a given set of input rows, passed in by the caller. The format of these rows are the same the as input stream rows.

Reportlets, alerts, and rules are converted into views and queries as depicted in FIG. 2, describing view engine 103. For a rule on a business view ‘bView’ in the form of

WHEN (<Boolean expression>) FIRE ALERT <alert name> the <Boolean expression> is evaluated for each row in the business view and the alert is fired once for each row for which the Boolean expression evaluates to true.

The business view can be converted into the following hidden view:

Select * from bView WHERE (<Boolean expression>)

For a rule on a business view bView in the form of

WHEN (<Boolean expression>) FIRE CONSOLIDATED ALERT <alert name> the <Boolean expression> is evaluated for each row in the business view and the alert is fired once if the Boolean expression evaluates to true for any of the rows. The bView can be converted it into the following hidden view:

Select 1 From dummyOneRowTable Where EXISTS (Select 1 From bView WHERE (<Boolean expression>)) DummyOneRowTable is a table containing one row

For a rule on a business view bView in the form of

WHEN (<rule Boolean expression>) RAISE ALERT <name of the alert> bView can be converted it to the following view:

Select * from bView WHERE (<Boolean expression>) and vc_event_id = vc_latest_event_id

For a rule on a business view bView in the form of

WHEN (<rule Boolean expression>) LOWER ALERT <name of the alert> bView can be converted it to the following view:

Select * from bView WHERE (<Boolean expression>) and vc_event_id = vc_latest_event_id

For a rule on a business view bView in the form of

WHEN (<rule Boolean expression>) HOLDS FOR <duration> RAISE ALERT <name of the alert> bView can be converts it to the following view:

Select bView.*, <duration> + currentTimeStamp( ) From bView WHERE (<Boolean expression>) and vc_event_id = vc_latest_event_id The function currentTimeStamp( ) returns the current timestamp.

For a rule on a business view bView in the form of

WHEN (<rule Boolean expression>) HOLDS FOR <duration> RAISE ALERT <name of the alert> FOR A SPECIFIC <view_column_list> bView can be converted it into the following view:

Select bView.*, <duration> +currentTimeStamp( ), <view_column_list> From bView WHERE (<Boolean expression>) and vc_event_id = vc_latest_event_id.

The alert manager provides the reportlet message as the mechanism to add additional context to the business view that caused the alert. A reportlet attached to an alert is any view in the system that is derived from the same base event that caused the alert to be raised/fired.

There are three kinds of reportlets. One kind of reportlet is populated by using only the rows affected by the current event. For the first case, the reportlet is defined as a regular business view. A second kind of reportlet is populated by using all the rows in the business view. For the second case, the reportlet is defined as a business view, plus the following additional where clause condition: vc_event_id=vc_latest_event_id. The third kind of reportlet is populated by using only the rows for which the rule evaluates to true. For the third case, the reportlet is maintained by the stateful query mechanism as described above: the rows produced by the hidden associated rule view are passed to the query view and the reportlet is populated as the view snapshot.

A Java database connectivity (JDBC) context view is defined as a regular JDBC SQL query, say <context-query-definition>. A context lookup query for a two table joined view

select <select expression list> from streamTable, contextTable where <search-conditions> is formulated based on the following algorithm-2-table-join-context-lookup:

convert the <search-condition> into conjunctive normal form <new-search-condition> = true For all conjunct in the normal form construct a new <condition-expression> by replacing all references in the conjunct to non-context column in the query as bind value (represented as a ‘:’ symbol). <new-search-condition> := <new-search-condition> and  <condition-expression> Formulate the context lookup query as follows: select * from (<context-query-sql-definition>) a where <new-search-condition>

In the case of multiple context table references, the process proceeds with the optimizer generating a join plan, each join node joining only two tables. A n-table join becomes n−1 join nodes of two table joins. The join takes the form of a left deep tree, which first joins the stream table with a content table, the join result then joins with the next context table, and so on. The following shows an example of the left-deep join plan:

for each two table join

-   -   invoke algorithm-2-table-join-context-lookup to construct the         context look up query for the context table         This is depicted in FIG. 9 as a left deep query tree 900. In one         embodiment, the query composes a context query in SQL, other         than a JDBC query.

Query tree 900 is extended to cover the case when a bushy query plan is created by the optimizer:

for each two table join

-   -   if the left input of the join is a context table         -   invoke algorithm-2-table-join-context-lookup to construct             the context look up query for the context table     -   if the right input of the is a context table         -   invoke algorithm-2-table-join-context-lookup to construct             the context look up query for the context table             Query tree 900 applies to the case when the join type is             either an INNER join or a Left outer join. All right outer             join has been converted into left outer join by exchanging             the position of the inner and outer table, therefore the             optimizer does not need to deal with right outer join. A             bushy query plan 1000 is depicted in FIG. 10.             Exemplary Process

FIG. 11 is a flowchart of a process 1100 for providing a real time view of heterogeneous enterprise data of an operational system. Process 1100 begins with step 1101, wherein a stream of operational events is captured in real time. In step 1102, a resulting view is materialized within the defined time window. The resulting view comprises a dynamically defined view of the stream of events and provides visibility into a current state of the operational system. Thus, process 1100 comprises a method by which a system for generating a real time view of heterogeneous enterprise data (e.g., System 100; FIG. 1) operates. Process 1100 can be performed by a computer system or network of computer systems under the control of a computer readable program code embodied in a computer usable medium.

In summary, a method for generating a real time view of heterogeneous enterprise data is disclosed. Embodiments of the present invention are directed to a method for generating a real time view of heterogeneous enterprise data that is both event-definitive and context-definitive. An embodiment of the present invention readily formulates and sustains a maintainable real time view of business events, such as transactions, and related occurrences, incidents, and circumstances. Further, an embodiment of the present invention has contextually interpretive and dynamically predictive usefulness.

An embodiment of the present invention, a method for generating a real time view of heterogeneous enterprise data, is thus described. While the present invention has been described in particular embodiments, it should be appreciated that the present invention should not be construed as limited by such embodiments, but rather construed according to the below claims and their equivalents. 

What is claimed is:
 1. A method comprising: generating a dynamically defined view of a stream of operational events captured in real time, wherein the dynamically defined view provides visibility into a current state of the operational systems; generating a hidden rule view, based on the dynamically defined view and a hidden rule, wherein the hidden rule is selected from the group consisting essentially of Fire, Raise, and Lower, wherein the hidden rule view is not output for display and is usable to evaluate the hidden rule; generating for display, based on the hidden rule view and context data associated with an event of the stream of events, a business view that is usable to define a set of business rules; and responsive to determining that one of the set of defined business rules holds true, generating for display, a reportlet corresponding to an alert that is based at least in part on the one of the set of defined business rules.
 2. The method as recited in claim 1 further comprising: generating a hidden reportlet view from the business view; and asynchronously sending the reportlet view to a reportlet engine.
 3. The method as recited in claim 1 further comprising: formulating a reportlet query from the business view; and synchronously sending said reportlet query to a reportlet engine.
 4. The method as recited in claim 1 wherein a user defines the one of the set of defined business rules from the business view online and wherein the rule engine defines the hidden view for evaluating the hidden rule.
 5. The method as recited in claim 1 wherein, for the business view in the form of when a specified Boolean expression occurs, fire the alert, the Boolean expression is evaluated for each row of a plurality of rows comprising said business view and the alert is fired once for each row of said plurality of rows wherein the Boolean expression evaluates to true.
 6. The method as recited in claim 4 wherein, for the business view in the form of when a specified Boolean expression occurs, fire a consolidated alert wherein the hidden view comprises a table containing one row, the Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the consolidated alert is fired once where said Boolean expression evaluates to true for any row comprising said plurality of rows.
 7. The method as recited in claim 4 wherein, for the one of the set of defined business rules in the form of when a specified Boolean expression occurs raise the alert, the Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is raised by a fixed amount.
 8. The method as recited in claim 4 wherein, for a rule on the business view in the form of when a specified Boolean expression occurs, lower the alert, the Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is lowered by a fixed amount.
 9. The method as recited in claim 4 wherein, for a rule on the business view in the form of when a specified Boolean expression holds for a specified duration, raise the alert, wherein the hidden view comprises a current time stamp function, the current time stamp function returning a timestamp corresponding to the current time, the Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is raised by a fixed amount when the Boolean expression persists for the specified duration.
 10. The method as recited in claim 4 wherein, for a rule on the business view in the form of when a specified Boolean expression holds for a specified duration, lower the alert, wherein the hidden view comprises a current time stamp function, the current time stamp function returning a timestamp corresponding to the current time, said Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is lowered by a fixed amount when the Boolean expression persists for the specified duration.
 11. The method as recited in claim 4 wherein, for a rule on the business view in the form of when a specified Boolean expression holds for a specified duration, raise an alert, for a specific column of a column list, wherein the hidden view comprises a current time stamp function, the current time stamp function returning a timestamp corresponding to the current time, said Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is raised by a fixed amount when said Boolean expression persists for the specified duration for the specific column.
 12. The method as recited in claim 4 wherein, for a rule on the business view in the form of when a specified Boolean expression holds for a specified duration, lower the alert, for a specific column of a column list, wherein the hidden view comprises a current time stamp function, the current time stamp function returning a timestamp corresponding to the current time, the Boolean expression is evaluated for each row of a plurality of rows comprising the business view and the alert is lowered by a fixed amount when the Boolean expression persists for the specified duration for the specific column.
 13. A non-transitory computer usable medium having computer readable program code embodied therein that causes a computer system to: generate a dynamically defined view of a stream of operational events captured in real time, wherein the dynamically defined view provides visibility into a current state of the operational systems; generate a hidden rule view, based on the dynamically defined view and a hidden rule, wherein the hidden rule is selected from the group consisting essentially of Fire, Raise, and Lower, wherein the hidden rule view is not output for display and is usable to evaluate the hidden rule; generate for display, based on the hidden rule view and context data associated with an event of the stream of events, a business view that is usable to define a set of business rules; and responsive to determining that one of the set of defined business rules holds true, generate for display, a reportlet corresponding to an alert that is based at least in part on the one of the set of defined business rules.
 14. The non-transitory computer usable medium of claim 11 having computer readable program code embodied therein that causes the computer system to: generate a hidden reportlet view from the business view; and asynchronously send the reportlet view to a reportlet engine.
 15. The non-transitory computer usable medium of claim 11 having computer readable program code embodied therein that causes the computer system to: formulate a reportlet query from the business view; and synchronously send said reportlet query to a reportlet engine.
 16. A computer system comprising: at least one processor; and a memory comprising a plurality of instructions that when executed by the at least one processor cause the at least one processor to: generate a dynamically defined view of a stream of operational events captured in real time, wherein the dynamically defined view provides visibility into a current state of the operational systems; generate a hidden rule view, based on the dynamically defined view and a hidden rule, wherein the hidden rule is selected from the group consisting essentially of Fire, Raise, and Lower, wherein the hidden rule view is not output for display and is usable to evaluate the hidden rule; generate for display, based on the hidden rule view and context data associated with an event of the stream of events, a business view that is usable to define a set of business rules; and responsive to determining that one of the set of defined business rules holds true, generate for display, a reportlet corresponding to an alert that is based at least in part on the one of the set of defined business rules.
 17. The computer system of claim 16, wherein the memory comprises further instructions that when executed by the processor cause the processor to: generate a hidden reportlet view from the business view; and asynchronously send the reportlet view to a reportlet engine.
 18. The computer system of claim 16, wherein the memory comprises further instructions that when executed by the processor cause the processor to: formulate a reportlet query from the subsequent business view; and synchronously send the reportlet query to a reportlet engine. 